I think the song has more in common with their mid-1970's hits like "Jive Talkin'", and the song at the link above, "Nights On Broadway", than it does with "Stayin' Alive". And I think that is a big reason why I love it so much. The use of so much instrumentation, and the drama that the song provides in building wave after wave, from the beginning to the link from verse to chorus. It's very unique and is a major reason why I think this song is fantastic.
It's also incredibly easy to sing along to in the car all alone. :)
And we haven't even talked about the emotion of the message of the song, given greatly by the vocals, which, of course, were the signature of the Bee Gees.
It's weird to type these two words together, but enjoy "Tragedy"! :)